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Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
If you try to open a tab-delimited text file that begins with the letter "C" in Microsoft Excel 2002, you may receive the following error message:
Cannot open protected file.
To resolve this problem, obtain and install the Excel 2002 security patch that is described in Microsoft Knowledge Base article 830350. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
830350 Overview of the Excel 2002 Security Patch: November 11, 2003
After you install this hotfix, follow the steps that are listed in the "More Information" section of this article to set the QFE_Osaka registry key and to activate the hotfix.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To activate this hotfix, follow these steps:
Quit Excel 2002.
Click Start, and then click Run.
In the Open box, type regedit, and then click OK.
Locate, and then click to select the following registry key: